The square on a cricket field is almost never square, but usually rectangular! It is the central area where the pitches are marked out and where the bowling and batting take place. The groundsman and groundstaff, who usually take great pride in producing good pitches, will pay very special attention to the condition of the square.
The larger the playing area, the bigger the square will be. The bigger the square, the more pitches can be accommodated, which means that more matches can be played on that ground.